Today, KGI Securities analyst Ming-Chi Kuo published a note predicting that the upcoming Apple smartphone (iPhone 8?) Will reduce a battery of a larger size in a smaller format 4.7 inches, possibly with better performance than the battery of a 5.5 inch LCD iPhone.
This would be achieved by using a more stacked logical board design, also known as a substrate-like PCB (SLP) board, which would create more space within the device to accommodate a significantly larger battery.
The design should allow Apple engineers to reduce a "Plus" battery inside a smaller device with an OLED display and similar dimensions to a 4.7-inch iPhone.
This is a part of Kuo's report:
Because battery material technology is not likely to see significant advances in the next 3-5 years, the motherboard area can only be reduced through the SLP stack, which gives room for a larger battery and a Time of prolonged use.
Thanks to the SLP stack, we expect the OLED iPhone to be similar in size to a 4.7-inch LCD iPhone and to have comparable battery capacity to a 5.5-inch iPhone.